Ferdinand gross



(NdModeL) F. GROSS.

TELEPHONE REGEIVER. No. 488,'718. Patented Oct. 4, 1892.

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UNITED STATES PATENT OFFICE. i

FERDINAND GROSS, OF MONTREAL, CANADA.

TELEPHON E-RECEIVER.

SPETFICATION forming part of Letters Patent No. 483,'718, dated October4, 1892.

Application filed January 18, 1892. Serial No. 418,466. (No model.)Patented in Canada January 2, 1892, No. 38,043.

To all whom it may concern:

Be it known that I, FERDINAND GRoss, of the city of Montreal, in thedistrict of Montreal and Province of Quebec, Canada, have inventedcertain new and useful Improvements in 'l`elephone-Receivers, (for whichI have obtained Letters Patent of Canada, No. 38,043, dated January 2,1892 and I do hereby declare that the following is a full, clear, andexact description of the same.

This invention relates to devices attached to the ends oftelephone-receivers to exclude external sounds without discomfort to theuser from a firm pressure of the instrument against the head.

The object of my invention is to producea device of this kind which canbe applied to the receiver without detriment to the same and which willmore efiectually exclude eX- ternal sounds by allowing a greaterpressure without any discomfort and secure a perfect accommodation ofits surface to the part of the useris head against which it is pressed.

My device is an air-cushion Constructed of a soft-rubber hollow annuluswith the necessary air-tube and having an elastic hood or sleeve forsecuring it in place upon the end of the telephone-recciver. For fullcomprehension, however, of the invention, reference must be had to theannexed drawings, in which like symbols indicate corresponding parts,and wherein- Figure 1 is a perspective view of a telephone-receiver withmy air-cushion attached. Fig. 2 shows a longitudinal section of theaircushion in place, the receiver being shown in elevation; and Fig. 3 adetail semi-sectional view of the device removed.

The device is Constructed wholly of soft rubber, (according to methodswell known to rubber-goods manufacturers,) A being a hollow annulusadapted to be inflated through the tube B, the end of which can beclosedin any desired way.

C is an elastic hood or sleeve conical in form and projecting` from theperiphery of the annulus A, so as to be fitted over the end of thereceiver and hold the annulus in place. It will be seen that thecompressible quality of the annulus can be varied by the quantity of airintroduced and that the device as a whole is easily attached or removedwithout damaging the receiver in any Way.

What I claim is as follows:

1. The combination, with a telephone-rcceiver, of acornpressible cushionheld in place with one side bearing against the face of such receiver bya detachable fiexible connection, for the purpose set forth.

2. The combination, with a telephone-receiver, of a compressibleair-cushion and a conically-shaped sheet-rubber elastic hood, as shown,and for the purpose set forth.

3. The combination, with a telephone-receiver, of a soft-rubberair-cushion held in place with one side bearing against the face of suchreceiver by a detachable flexible connection, for the purpose set forth.

4. The combination, with a telephone-receiver, of a soft-rubber hollowinflated annulus A, inflating-tube I ',-and elastic hood C, as shown,and for the purpose set forth.

Montreal, 13th day of January, 1892.

FERDINAND GROSS. Witnesses:

WILL P. MCFEAT, FRED. J. SERs.

